GED Science Extra Prep: The Human Body
The GED Science test will contain questions that test your knowledge of how the human body works. These questions may focus on our internal systems—the digestive, circulatory, and metabolic systems are just a few—so you should have at least a basic knowledge of how these systems work and what they do.
- What is the name of the human body system consisting of the skin, hair, and nails that serves to protect the body from various kinds of damage, such as loss of water or abrasion, from the outside?
A. digestive system
B. integumentary system
C. circulatory system
D. muscular system
Use the following information to answer the next question.
Blood consists of a liquid called plasma with red and white blood cells and proteins suspended in it. Red blood cells carry oxygen from the lungs to all the cells of the body, where it is used during cellular respiration. White blood cells produce antibodies that help protect the body from infectious diseases. The plasma consists mainly of water and surrounds the blood cells. It helps maintain blood pressure and body temperature and helps transport nutrients around the body and remove waste products. The percentage of each major component of blood is shown in the table.
- What is the main function of the white blood cells?
A. They carry oxygen to all the cells of the body, where it is used during cellular respiration.
B. They help transport nutrients around the body.
C. They produce antibodies that help protect the body from infectious diseases.
D. They help remove waste products from the body.
Answers and Explanations
- The correct answer is B.
The integumentary system is the protective layer of the body including the skin, hair, and nails, so Choice (B) is correct. The digestive system is involved in breaking down food into nutrients, but it isn’t involved in protecting the body from the outside, so you can reject Choice (A). The circulatory system transports nutrients dissolved in the blood to all the cells of the body but doesn’t protect against damage, so Choice (C) is incorrect. The muscular system is responsible for the movement of the body itself, so Choice (D) is incorrect.
- The correct answer is C.
The passage tells you that white blood cells produce antibodies that help protect the body from infectious diseases, making Choice (C) the correct answer.